I've run into the exact same problem.
I started with fully patched CentOS 7 on Asus and SuperMicro motherboards using the stock InfiBand software. mst start would not create devices on CentOS 7 - although lsci showed them to be there and it looked like all appropiate drivers were installed
The InfiniHost III boards (I've tested 4) are taken from Isilon IQ6000 and IQ12000 systems.
A friend experienced with IB hardware said that the firmware should be reflashed but I've not managed to do that. He's been unable to get the cards to work in a server which also has newer Mellanox cards.
[root ~]# lspci | grep Mellanox
02:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex (Tavor compatibility mode) (rev 20)
[root ~]# mst start
Starting MST (Mellanox Software Tools) driver set
Loading MST PCI module - Success
Loading MST PCI configuration module - Success
Create devices
[root ~]# mst status
MST modules:
------------
MST PCI module loaded
MST PCI configuration module loaded
MST devices:
------------
/dev/mst/mt25208_pciconf0 - PCI configuration cycles access.
bus:dev.fn=02:00.0 addr.reg=88 data.reg=92
Chip revision is: A0
/dev/mst/mt25208_pci_cr0 - PCI direct access.
bus:dev.fn=02:00.0 bar=0xfea00000 size=0x100000
Chip revision is: A0
/dev/mst/mt25208_pci_ddr0 - PCI direct access.
bus:dev.fn=02:00.0 bar=0xdf800000 size=0x800000
[root ~]# ibv_devinfo
No IB devices found
[root ~]# flint -d /dev/mst/mt25208_pci_cr0 query
Received CFI query from addr 0x10: [▒&]
Received CFI query from addr 0x20: [Z]
-E- Can not open /dev/mst/mt25208_pci_cr0: MFE_CFI_FAILED
[root MLNX_OFED_LINUX-1.5.3-4.0.42-rhel5.10-x86_64]# mstflint -d 0:02.0 -i fw-25208-4_8_200-MHEL-CF128.bin b
Warning: memory access to device 0:02.0 failed: No such device or address.
Warning: Fallback on IO: much slower, and unsafe if device in use.
-E- Can not open 0:02.0: No such file or directory MFE_CR_ERROR
[root MLNX_OFED_LINUX-1.5.3-4.0.42-rhel5.10-x86_64]# mstflint -d /dev/mst/mt25209_pciconf0 -i fw-25208-4_8_200-MHEL-CF128.bin b
Unable to parse device name /dev/mst/mt25209_pciconf0
-E- Can not open /dev/mst/mt25209_pciconf0: Invalid argument MFE_CR_ERROR
[root ~]# lspci |grep Mellanox | awk '{print $1}' | xargs -i -r lspci -s {} -xxxvvv
02:00.0 InfiniBand: Mellanox Technologies MT25208 InfiniHost III Ex (Tavor compatibility mode) (rev 20)
Subsystem: Device 4953:0008
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 169
Region 0: Memory at fea00000 (64-bit, non-prefetchable) [size=1M]
Region 2: Memory at df800000 (64-bit, prefetchable) [size=8M]
Region 4: Memory at a0000000 (64-bit, prefetchable) [size=512M]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [90] MSI: Enable- Count=1/32 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [84] MSI-X: Enable- Count=32 Masked-
Vector table: BAR=0 offset=00082000
PBA: BAR=0 offset=00082200
Capabilities: [60] Express (v1) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 unlimited
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
LnkCap: Port #8, Speed 2.5GT/s, Width x8, ASPM L0s, Latency L0 unlimited, L1 unlimited
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
Kernel modules: ib_mthca
00: b3 15 78 62 06 01 10 00 20 00 06 0c 10 00 00 00
10: 04 00 a0 fe 00 00 00 00 0c 00 80 df 00 00 00 00
20: 0c 00 00 a0 00 00 00 00 00 00 00 00 53 49 08 00
30: 00 00 00 00 40 00 00 00 00 00 00 00 0a 01 00 00
40: 01 90 02 00 00 00 00 00 03 90 ff 7f 11 11 00 00
50: 00 00 00 00 00 00 00 00 14 00 0f 00 78 62 a0 02
60: 10 00 01 00 20 0e 2c 01 00 50 00 00 81 f4 03 08
70: 40 00 81 10 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 11 60 1f 00 00 20 08 00 00 22 08 00
90: 05 84 8a 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00